windows/system32/config/system missing

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ok i already posted cuz i saw there are more ppl w same problem but just to be sure someone will see,typo again.when i started my pc today it give me that message that windows/system32/config...is missing and to press r to recover,it did nothing when i press it but when i pressed f5 it started.i dont hve windows cd,my brother does,do i need to take it?rolleyes

 

Your registry is corrupt.

Specifically your system hive.

This says for XP, but works for Vista and 7 as well.

http://support.microsoft.com/kb/307545

 

yes i found that,thanx anyway.i will manage it.i am just interested wth happend?:confused

 

Bad shutdown, bad install, virus, memory glitch/failure, hard drive failing or filesystem error...you name it.